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x in (-oo:+oo)
8/14 = x^21 // - x^21
8/14-x^21 = 0
-1*x^21 = -4/7 // : -1
x^21 = 4/7
x^21 = 4/7 // ^ 1/21
x = (4/7)^(1/21)
x = (4/7)^(1/21)
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